davis



(No Model.)

A. B. DAVIS. Car Spring.

No. 231,018. Patented Aug. 10,1880.

@itmasns ATTOP IE N4 PETERS, FHOTO-LITNOGRAPHER. wAsm UNITED STATESAUGUSTUS B. DAVIS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OFNINE-TWENTIETHS OF HIS RIGHT TO JOHN K. BOYER, OF SAME PLACE.

CAR-SPRING.

SPECIFICATION forming part of Letters Patent No. 231,018, dated August10, 1880.

Application filed May 18, 1880.

To all whom it may concern:

Be it known that I, AUGUSTUS B. DAVIS,

a citizen of the United States, residing in the city and county ofPhiladelphia, and State of Pennsylvania, have invented a new and usefullmprovementin Springs for Cars, &c., (Case A,) which improvement isfully set forth in the following specification and accompanyingdrawings, in which Figure l is a perspective view of the springembodying my invention. Fig. 2 is a vertical section thereof in line a:m, Fig. 1.

Similar letters of reference indicate corresponding parts in the twofigures.

This invention relates to car-springs which are provided with slidingheads and an intermediate diaphragm, a series of helical springs beinginterposed between said diaphragm and each head.

The nature of said invention consists in certain improvements in theabove mentioned class of car-springs, which will be hereinafter moreparticularly set forth and claimed.

Referring to the drawings, A represents the box or case, and B thesprings, which are in two series, separated by the diaphragm O. The caseA is formed of two heads, a b, the head a consisting of the face-plate 0and the sides (I, and the part b of the face-plate c and the sides f.

Projecting outwardly from the plates 0 care spurs D, cast therewith,which may be conical, pyramidal, or other suitable shape, their objectbeing to penetrate the wood or enter the material with which the box orcase A is in contact when located in operative position, thus preventingshifting of said box or case.

Secured to or cast with the sides (I of the part a of the box or case Ais a band or offset, E,which in a measure forms continuations of saidsides (1 and OX'GIlHPS the sides f of the part b of the box or'case, asmore clearly shown in Fig. 2, it being noticed that the ends of thesides df, or properly of theheads, are opposed and adapted to move toand from each other.

1 represents bolts which are passed through the two heads of the box orcase for connectin g them. The heads of the bolts rest against the plate0 of the head I), and their ends are passed freely through lugs G,projecting inwardly from the sides (I of the head a. Said ends of thebolts then appear on the outside of said sides (Z,where (as at a) theyare headed or threaded to receive nuts, grooves a being (No model.)

formed exteriorly on the sides 01 for the passage of the heads or nutsof the ends of the bolts as the heads of the box or case A approach orrecede from each other.

When the spring is in service the load, if ordinary, is carried by thelower set of springs, B, as they are in the present ease of less powerthan the upper set, and as the load increases the upper set of springsis brought into play. By this gradation of resiliency the car rides withcase under light and heavy loads, and as the heads a I) move toward andfrom each other the band or offset E acts as a guide, thus keeping saidheads true and causing uniform motions thereof, this being assisted bythe bolts F, which, connecting the two heads, also serve as guides, itbeing noticed that the length of the bolts is less than the actualheight of the spring box or case.

Should the springs be loaded in excess of their resiliency orresistance, the heads abut against each other and thus receive thethrust or load as stops, and prevent injury to the springs. it will alsobe seen that there is no loss of room within the box or case A.

The heads are of the same width, and vir- 8o tually flat and flush ontheir outer faces, the only parts interposed between the ends of thesprings and contiguous portion of the cartruck, &c., being the thicknessof the outer faces or face-plates c a. The springs B may thus be madeshort, while the range thereof is large.

\Vhen the band E is a separate piece from the follower or head a it ispreferably shrunk thereon in order to be securely held in position.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The spring-containing box or case A, formed of two heads orfollowers, c I), provided 5 with inwardly-projecting lugs G and thebolts F, substantially as and for the purpose set forth.

2. The box or case A, consisting of two followers or heads, a. b, ofuniform width, having the circumfereititial band E and inclosing thebolts F and springs B, substantially as and for the purpose set-forth.

A. B. DAVIS.

Witnesses JOHN A. Wmnnnsnnnvr, A. P. GRANT.

